Bucket for power shovels



Nov. 3, 1953 1.. E. SMITH BUCKET FOR POWER SHOVELS 2 Sheets-Sheet 1 Filed Sept. 17, 1948 INVENTOR.

Luke E. Smith ATTORNEY Nov. 3, 1953 1.. E. SMITH BUCKET FOR POWER SHOVELS Filed Sept. 17, 1948 2 Sheets-Sheet 2 INVENTOR. Luke E. Smhh ATTORNEY Patented Nov. 3, 1953 BUCKET FOR POWER SHOVELS Luke E. Smith, Denver, 0010., assignor to Quick- Way Truck Shovel 00., Denver, 0010., a corporation of Colorado Application September 17, 1948, Serial No. 49,805

Claims.

This invention relates to a bucket for power shovels and more particularly to a bucket for power shovels or the like that has a forced dumping feature.

In many shovel operations, it is necessary to work in soils or clays that have a tendency to adhere to the bucket sides and bottoms. This tendency of the material to adhere to the bucket is even greater where the material being handled is wet. In operations where it is necessary to move large quantities of such adhesive materials, a conventional shovel bucket has not proved to be entirely satisfactory inasmuch as clogging of the material reduces the capacity of the bucket. When the capacity of such a bucket is reduced, the amount of material moved over a given period of time is decreased. This decreased load capacity effects the overall efficiency of the operation and greatly increases the costs of operation where clogging materials are being handled It is an object of this invention to provide a bucket for power shovels or the like that will not clog when used to dig or load adhesive materials.

It is another object of this invention to provide a shovel bucket that will maintain a uniform load capacity when used in wet or soggy materials that have a tendency to clog.

A further object of this invention is to provide a shovel bucket that will forceably dump the materials being handled from the bucket.

A still further object of this invention is to provide a trench hoe shovel bucket that will forceably dump the materials being handled.

Another object of this invention is to provide a shovel bucket in which relative movement of bottom and side members causes the material in the bucket to be forceably dumped.

Other objects and advantages of this invention will be apparent from the appended description and drawings in which:

Fig. 1 is a top plan view of a truck mounted trench hoe power shovel incorporating the features of this invention.

Fig. 2 is a side elevation of a power shovel having a bucket according to this invention.

Fig. 3 is a perspective view of a trench hoe shovel bucket in the dumping position, showing the features of this invention.

Fig. 4 is a perspective view of a bucket in the digging position.

Fig. 5 is a cross sectional view taken along the line 5-5 of Fig. 4.

Briefly stated the present invention provides a shovel bucket in which the sides are rigidly attached to a pivoted dipper stick and in which a 2 curved bottom member is pivotally mounted between the sides; The curved bottom member is connected by a pivoted arm to the shovel boom. The arrangement of pivots on the shovel boom for the dipper stick and for the arm is such that thecurved bottom will be in cupped arrangement with the sides of the bucket when the bucket is moved through the digging position and will move between and relative to the sides as the dipper stick is raised to a dumping position. The dipper stick and bucket are swung about their pivots by means of cables reeved in a conventional manner to connect the bucket and the end of the dipper stick to suitable hoisting drums of the power shovel.

Referring now to the drawings, Figs. 1 and 2 show a general arrangement of the elements ofthis invention. As shown; a power shovel assembly here shown as the trench hoe type, mounted on a truckchassis l2 has a boom 3 extending from the frame ll of the power shovel I A dipper stick I 6 is pivotally mounted on the outer end of boom l3 by means of a pivot shaft l1. On one side of pivot shaft dipper stick IB is of a forked construction to provide separate spaced arms l8. On the other side of pivot shaft l1 an extension I9 is provided. Bucket sides 2| are rigidly attached to the separate spaced arms I8 of dipper stick I6 by means of bolts 22, metal weld, or other attaching means. Bucket teeth 23 connect the sides 2| at one extremity of the sides. Likewise a shaft 24 is provided adjacent bucket teeth 23 to interconnect the sides 2|.

A curved bottom member 26 of such dimension that it may be received between the sides 2| is pivotally mounted on shaft 24 for relative rotation between sides 2|. At a point removed from shaft 24 flanges 25 having holes 21 therein are provided on the curved bottom member 26. A

pivot bolt 28 passing through the holes in said flanges is arranged to pivotally engage a rigid arm 29 to interconnect the curved bottom 26 with the boom l3. Rigid arm 29 is pivotally secured to boom 3 by means of a clamp 3| and a second pivot bolt 32. Clamp 3| is arranged on boom |3 at a point nearer the frame 14 of power shovel than pivot shaft Rigid arm 29 is of such length and shape and clamp 3| is so placed on boom |3 that curved bottom member 26 will be in cupped arrangement with the sides 2| when the dipper stick I6 is moved into the usual digging position. This cupped arrangement is best illustrated in Figs. 1 and 4. In these views the curved bottom is seen to be in position along a bottom edge 33 of sides 2|. Likewise rigid arm 29 is of such length and shape that curved bottom member 28 will be rotated between and relative to sides 2| as the dipper stick I6 is hoisted into the usual dumping position. This feature is best shown in Figs. 2 and 3. In these figures the curved bottom is shown in a position where it is almost out of contact with sides 2|. As may be seen, any material that was received between the curved bottom 26 and sides 2| in a digging position would be forcibly ejected when the dipper stick was raised to the dumping position.

For the purpose of raising and lowering the boom to the separate positions and for rotating the dipper stick l6 about pivot shaft I1, two separate cable systems are provided. A first cable 36 passes from a main hoisting drum 34 of power shovel over a sheave 3'! mounted on gantry frame 38 and through a pulley 39 attached to extension IQ of dipper stick IS. A second cable 4| passes from a haul back drum 42 of power shovel over boom drum 43 to rotate drums 44, which in turn have a cable 46 wound thereon. Cable 46 passes through an equalizer 41. Equalizer 41 is connected to brace members 48 on the bucket sides 2| by chain links 49.

In operation boom I3 is lowered and dipper stick I6 is put in position for digging by reeving out cables 36 and 4|. When the bucket con.- tacts the ground, cable 4| is reeved in as cable 35 is allowed to pass out over sheave 37. The reeving in of cable 4| provides a powered crowd which pulls dipper stick l6 through an are about pivot I! to fill the space between the curved bottom 26 and sides 2|. As shown in broken lines in Fig. 2 when the boom i3 and dipper stick l6 are in the position described, the curved bottom and sides are in cupped arrangement so that a load of material may be received and held in the enclosure. To dump the material cable 36 is reeved in over main hoisting drum 34 to raise the boom I3 as cable 4| is reeved out to allow the dipper stick to swing outwardly about pivot shaft As the dipper stick It moves outwardly linkage arm 29 causes the curved bottom member 26 to be pulled be tween and past the sides 2|, thereby dumping the material from the bucket. In order to assure the application of equal forces to the bucket sides 2| and the arms I8 attached thereto, an

equalizer 41 through which cable 45 passes is 3 provided to equalize the tension in cable 46 as it is reeved over drums 44.

Thus it is seen that the applicant has provided a bucket for power shovels or the like which may be used in wet or other adhesive materials without loss of capacity due to clogging of the materials in the bucket. By providing relative motion between the curved bottom and the sides the bucket tends to stay clean and the capacity of the bucket remains unchanged.

The bucket provided is simple in operation, and has few working parts thereby minimizing repair and upkeep costs. .Also the bucket is readily adaptable to conventional power shovels inasmuch as no special cable reeving is required. Since the bucket is adapted to conventionally rigged shovels and since shovel operators are familiar with the sequence of operations necessary, use of this bucket requires only a small expenditure for change-over parts and there is no appreciable loss due to unfamiliarity with the new bucket arrangement.

While this invention, as shown and described, pertains to a bucket for a trench hoe shovel it will be apparent to those skilled in the art that the invention is applicable to other types of power shovels and to other types of earth moving equipment. Likewise, while the applicant has disclosed a linkage that causes the bucket bottom to be moved past the sides, it is obvious that the sides could be made to move past the bottom to attain a similar result. Such obvious modifications are deemed to be within the scope of this invention and the applicant does not wish to be limited to the specific showing and description. The essential limitations to the scope of this invention will be found in the appended claims.

What is claimed is:

1. A swingable bucket for power shovels and the like comprising a dipper stick pivotally mounted on the boom forming a part of the power shovel, bucket sides fixedly attached to said dipper stick, a pivot shaft connecting the sides, a curved movable bottom member pivoted about said shaft, and a rigid arm pivotally sccured to the boom in spaced relation to the dipper stick pivot and pivotally connected to said bottom for moving the bottom between the sides when the dipper stick is raised to a dumping position.

2. A swingable bucket attachment for power shovels and the like comprising a pair of arms pivotally mounted on the boom forming a part of said power shovel, bucket sides fixedly attached to said arms, a single arm member pivotally mounted on said boom in spaced relation to the arms pivot, a bucket bottom pivotally attached to said single arm, a pivot shaft attached to the bucket sides and said bucket bottom for relative pivoting of said bottom with respect to the sides, and means operable to move said pair of arms with respect to the single arm whereby the bucket bottom and sides are relatively pivoted to contain material in one position of the bucket and to forcibly dump the material in a second position thereof.

3. A swingable bucket attachment for power shovels and the like comprising a pair of like arms pivotally mounted on the boom forming a part of said power shovel, bucket sides rigidly attached to said pair of arms at one end of said sides, a single arm member pivotally mounted on said boom at a point spaced from the pivotal mounting of the pair of arms on the boom, a bucket bottom pivotally attached to said single arm, a. pivot shaft at a point removed from said pair of arms and attached to the rigidly mounted bucket sides and said bottom for relative swinging movement of said bottom with respect to the sides, and means operable to move the pair of arms with respect to the single arm whereby to swing the bottom of the bucket relative to its sides to contain materials when the bucket is in a digging position and to forcibly dump the :naterials when the bucket is in a dumping posi- .1011.

4. A swingable bucket attachment for the boom of a power shovel and the like comprising a dipper stick pivotally mounted near the outer end of the boom forming a part of said power shovel, bucket sides rigidly attached to said dipper stick, an arm member pivotally mounted on said boom at a point intermediate the ends of said boom, a bucket bottom pivotally attached to said arm, a pivot shaft attached to the rigidly mounted bucket sides and said bottom to permit relative pivoting of said bottom with respect to the sides, and means operable to move said dipper stick with respect to the arm so that he sides and bottom are in cupped arrangement in the digging position to contain materials,- and are pivoted relative to each other to forcibly dump the materials as the dipper stick is raised to a dumping position.

5. A swingable bucket attachment for the boom of a power shovel and the like, comprisin arms pivotally mounted on the outer end of the boom forming a part of said power shovel, bucket sides rigidly attached adjacent their rear ends to said arms, a third arm curved in its length and pivotally mounted at one end on said boom at a location inwardly from the outer end of the boom and from the pivotal connection of dipper stick and boom, a bucket bottom disposed normally between said rigidly mounted bucket sides, said curved third arm being movably connected at its other end to the under side of said bucket bottom, a pivot shaft attached to the front end of both of said rigidly mounted bucket sides and said bucket bottom for relative rotation 01' said bottom with respect to said sides, and means op-' erable to move said first-named arms with respect to the other of said arms whereby to swing the bucket bottom relative to the bucket sides to contain material in one position of the bucket and to forcibly dump the material in another position thereof.

LUKE E. SMITH.

References Cited in the file of this patent UNITED STATES PATENTS 

